/*小屏幕*/
@media screen and (max-width: 768px) {
    .PE_CSS{
        display: block;
    }

    .PC_CSS{
        display: none;
    }
}


/*大屏幕，或者宽屏*/
@media screen and (min-width: 768px) {
    .PE_CSS{
        display: none;
    }

    .PC_CSS{
        display: block;
    }
}